Firstly: I'm not accusing (or even pointing fingers) any collusion or malice here.
Secondly: the only data (I would call it anecdotal at best) I have available is product pricing which is readily available to the public
As I shop for gear on massdrop, amazon and elsewhere for anything from DACs to headphones and everything in between, I've noticed a pattern in pricing: for any item certain range most, if not all, vendors sell a product at nearly the same price (be it ~$199 DACs or ~$350 amps or ~$500 speakers or ~$900 headphones). To me this raises red flags. In a competitive, efficient market vendors should try to compete and undercut each other, not settling on very tight price ranges. The fact presently there are several headphones at $899-and-change and at other other products at prices mentioned above scream of unintentional price fixing: w/o any malice or collusion among them, vendors choose to not undercut each other. i,e.: vendor A releases product P at price X, vendor B releases competing product Q at price X, then vendor C and vendor D follow suit whereas in an efficient market, vendor B would price Q at X - 5% (just as en example) in order to get customers looking their way. This lack of competitive efficiency hurts the consumer badly and if I'm right in my feeling/sensing we could be overpaying for the products we buy-- which are already quite pricey :(